package com.example.tests;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import com.thoughtworks.xstream.XStream;

public class ContactDataGenerator {

	public static void main(String[] args) throws IOException {

		if (args.length < 3){
			System.out.println("Please specify parameters: <amount of test data> <file> <format>");
			return;
		}
		
		int amount = Integer.parseInt(args[0]);
		File file = new File(args[1]);
		String format = args[2];
		
		if (file.exists()){
			System.out.println("File" + file + "exists, please remote it manually");
			return;
		}
		
		List<ContactData> contacts = generatorRandomContacts(amount);
		if ("csv".equals(format)){
			saveContactsToCsvFile(contacts,file);
		} else if ("xml".equals(format)){
			saveContactsToXmlFile(contacts,file);
		} else {
			System.out.println("Unknown format " + format);
			return;
		}
				
	}

	public static void saveContactsToXmlFile(List<ContactData> contacts, File file) throws IOException {
		XStream xstream = new XStream();
		xstream.alias("contact", ContactData.class);
		String xml = xstream.toXML(contacts);
		FileWriter writer = new FileWriter(file);
		writer.write(xml);
		writer.close();
	}
	
	@SuppressWarnings("unchecked")
	public static List<ContactData> loadContactsFromXmlFile(File file) {
		XStream xstream = new XStream();
		xstream.alias("contact", ContactData.class);
		return (List<ContactData>) xstream.fromXML(file);
	}
	
	private static void saveContactsToCsvFile(List<ContactData> contacts, File file) throws IOException {
		FileWriter writer = new FileWriter(file);
		for (ContactData contact : contacts){
			writer.write(contact.getFirstname() + "," + contact.getLastname() + "," + contact.getAddress() 
					  + "," + contact.getHome() + "," + contact.getMobile() + "," + contact.getWork() 
					  + "," + contact.getEmail() + "," + contact.getEmail2() + "," + contact.getBday()
					  + "," + contact.getBmonth() + "," + contact.getByear()  
					  + "," + contact.getAddress2() + "," + contact.getPhone2() + ",!" + "\n");
		}
		writer.close();
	}
	
	public static List<ContactData> loadContactsFromCsvFile(File file) throws IOException{
		List<ContactData> list = new ArrayList<ContactData>();
		FileReader reader = new FileReader(file);
		BufferedReader bufferedReader = new BufferedReader(reader);
		String line = bufferedReader.readLine();
		while (line != null){
			String[] part = line.split(",");
			ContactData contact = new ContactData()
				.withFirstname(part[0])
				.withLastname(part[1])
				.withAddress(part[2])
				.withHome(part[3])
				.withMobile(part[4])
				.withWork(part[5])
				.withEmail(part[6])
				.withEmail2(part[7])
				.withBday(part[8])
				.withBmonth(part[9])
				.withByear(part[10])
				.withAddress2(part[12])
				.withPhone2(part[13]);
			list.add(contact);
			line = bufferedReader.readLine();
		}
		bufferedReader.close();
		return list;
	}

	public static List<ContactData> generatorRandomContacts(int amount) {
		List<ContactData> list = new ArrayList<ContactData>();
		for (int i = 0; i < amount; i++) {
		  ContactData contact = new ContactData()
			.withFirstname(generateRandomString("Firstname"))
			.withLastname(generateRandomString("Lastname"))
			.withAddress(generateRandomString("Address"))
			.withHome(generateRandomString("Home"))
			.withMobile(generateRandomString("Mobile"))
			.withWork(generateRandomString("Work"))
			.withEmail(generateRandomString("Email"))
			.withEmail2(generateRandomString("Email2"))
			.withBday(generateRandomDay())
			.withBmonth(generateRandomMonth())
			.withByear(generateRandomYear())
			.withAddress2(generateRandomString("Address2"))
			.withPhone2(generateRandomString("Phone2"));
			list.add(contact);
		}
		return list;
	}
	
	public static String generateRandomString(String prefix) {
		Random rnd = new Random();
		if (rnd.nextInt(3) == 0) {
			return "";
		} else {
			return prefix + rnd.nextInt();
		}	  
	}
		
	public static String generateRandomDay() {
		Random rnd = new Random();
		int day = rnd.nextInt(32);
		if (day == 0) {
			return "-";
		} else {
			return day + "";
		}	  
	}
	
	public static String generateRandomMonth() {
		Random rnd = new Random();
		int monthIndex = rnd.nextInt(ContactData.monthNames.length);
        String monthName = ContactData.monthNames[monthIndex];
        return monthName;  
	}
	
	public static String generateRandomYear() {
		Random rnd = new Random();
		int year = rnd.nextInt(9999); 
		if (year == 0) {
			return "0";
		} else {
			return year + "";
		}
	}
	
}
